Rubber-holding attachment for pencils.



No; 806,235. PATENTED DEC} 5, 1905. I A. F. W. BOWEN.

RUBBER HOLDING ATTACHMENT FOR PENGILS APPLICATION FILED DEC. 2, I904.

UNITED STATES.

P T OFFICE.

ANNIE F. W. BOWEN, SAN FRANCISCO, CALIFORNIA.

RUBBER-HOLDING ATTACHMENT F OR PENCILS.

No. soezes.

Application filed December 2, 1904. Serial No. 235,265. I

To-all whom, it may concern:

Be it known that I, ANNIE E. W. BOWEN, a citizen of the United States,residing at San Francisco, in the county of San Francisco and State ofCalifornia, have invented'certain new and useful Improvements inRubber-Holdingin g is a specification.

Thls lnven tion relatesto an 1m provederaser- Attachments for Pencils,of which the follow holder for pencils, the object of my invention beingto provide a device of this character in which the eraser will besecurely held and in which it can be adjusted to compensate for Wear inthe eraser and also to allow any desired portion thereof to project fromthe holder.

the holder, the rubber being removed.

Referring to the drawings, 1 represents a holder which is made out ofmetal, preferably sheet metal of a suitable thickness. Said holdercomprises a smooth cylindrical part 2,

v by which it is secured to the end of the pencil 3, and a threadedcylindrical part 4, which holds the eraser 5. The part 2 of the holderis secured to the end of the pencil in any suitable manner, as by meansof a stem6, screwed through a hole in said cylindrical portion andhaving a milled head 7, by which it can be turned, the inner end of thescrew having a foot 8 to press the pencil firmly against the circularholding portion 2 of the holder and clamp the same.

The eraser consists of a piece of rubber 5 cylindrical in form, and isinserted in the portion'4 of the holder, being firmly clamped therein bymeans of a nut 9, which is screwed on the threaded portion' t of theholder. This threaded portion has a number, as three, of slitsv 10extending longitudinally from the open end of the holder to points nearthe end of said threaded portion, allowing the threaded portion toexpand and to be compressed. Said A threaded portion terminates at theouter end in a circular groove 14:, separated, of course,

into 'three sections bymeans of the three slits Specification of LettersPatent.

Fig. 2 is an enlarged longitudi-' Patented Dec. 5, 1905.

10, the inner surface of which groove forms blunt shoulder-sectionswhich extend inward and rest upon the surface of the piece of rubber 5.I Therefore by screwing the nut toward said outer end saidshoulder-sections are more and morestrongly pressed into the rubber andfirmly clamp the same, and when the nut rests directly over said groovethe eraser is firmly held in the holder.

tion said shoulder-sections spring outward and the eraser may beremoved. TlllS grooved I By screwing the, nut toward the pencil end ofthe threaded secend of the holder constitutes an important feature ofthis invention. Heretofore it has been the practice to use the sharpedges of the holder to grip the rubber. By continuing the thread up tothe end of the holder I am enabled to obtain a sufficient grip of therubber even though using the comparatively blunt ridge formed by theinner surface of the groove, and thus to sufficiently grip the.

rubber without cutting the same.

-Between the end of the penciLand the end of the rubber is interposed acoiled spring 11, attached at one end to a plate or disk 12'and at theother end inserted into the rubber.

The plate is retained within the holder by the shoulder 13 thereof. Thisspring expands and presses out the rubber when permittedto do so byunscrewing the nut 9. Atthe same time the plate or disk 12 beingretained within the holder serves to retain any irregularlyshaped eraserwithin the holder and prevent its entire extrusion therefrom.

The holder can be used over and over again on different pencils and with'difierent rubbers, and the-construction.is such as to convenientlyadmit of different kinds of rubber being substituted for differentpurposes, as desired. 1

i I claim 1. A device of the character described, comprising a holderhaving a threaded portion adapted to receive the rubber and having aplurality of slits extending inwardly from the rubber-holding end of theholder to a point near the opposite end of the threaded portion, andhaving a groove at the rubber-holding v.end forming aninwardly-extending shoulder adapted to firmly grasp the rubber withoutcutting, a nut screwed on said. threaded portion, and means forsecuringthe holder to the end of a pencil, substantially as described.

2. A device of the character described,'comprising a holderhaving athreaded portion adapted to receive the rubber and having a clamping apieceof rubber and having a shoulder, a plate retained within the holderbetween the shoulder and the end of the pencil and a spring secured. atone end to said plate and at the other end to said rubber, substantiallyas described.

In witness whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

ANNIE F. W. BOWEN. Vitnesses:

FRANCIS M. l/VRIGHT, BESSIE GORFINKEL.

